I would recommend putting your efforts into identifying the sound you want. If you switch your equipment in order to try a new sound every five years until you stumble into the sound that satisfies you... well, it may take decades.
I would embark on a research project to look for a sound that is really compelling to you. I would recommend also listening to live music, particularly acoustic. Is there something in that which emotionally stirs you, that makes you crave more? That is what you want. Find a few audiophiles nearby, go to local dealers. Ask to listen to warm tube sound as well as the best high end sound they have. Somewhere along the way you are likely to be astonished to find something really compelling.
Then look to change out your system to do get that sound.